Setts



(No Model.) 3 Sheets-Sheet 1.

G. OROMPTON 8: H. WYMAN. M. 0. 0110mm, Admiliistratrix of G. CROMPTON,Decd.

LET-OPP MECHANISM FOR LOOMS.

Patented June 14, 1887.

K PETERS PhOWUKhOZ-Iphbf- WI-Ihinglau. DJ;

Witnesses Q, Q, @AM-Qu UNITED STATES PATENT OFFICE.

GEORGE CROMPTON AND HORACE VVYMAN, OF WORCESTER, MASSACHU- SETTS, ASSIGNOR TO SAID GEORGE CROMPTON; MARY C. CROMPTON AD MINISTRATRIX OF SAIDGEORGE CROMPTON, DECEASED.

LET-OFF MECHANISM FOR LOOMS.

SPECIFICATION forming part of Letters Patent No. 364,807, dated June 14,1887.

Application filed May 7, 1853. Serial No. 94,152. (No model.)

letters on the drawings representing like parts.

This invention in loonis has especial reference to let-oil mechanism,whereby two warpbeams may be operated at one end of the loom. Ourinvention consists, essentially, in two warpbeams, their gears, and twoworms to r 5 engage and move them, combined with two concentric shafts,to which the said worms are attached, and with suitable means to engageand rotate the said shafts.

In connection with the parts just referred to we have arranged twoindependent whip-rolls to regulate the movement of the pawls andratchets which give movement to the said shafts. Other featuresof-invention,to be hereinafter described, will be specificallydesignated and pointed out inthe claims at the end of thisspecification.

Figure 1 is a righthand side elevation of a loom embodying ourinvention, viewing the loom in front of the breast-beam, the lay being,however, omitted; Fig. 2, a vertical section of the same just within theframe-work at the left-hand side of the loom, the said figure showing,however, the lay; Fig. 3, a top view of part of the right-hand end ofthe loom; Fig.

4, a detail justwithinthe inner side of the right-hand end of the loomFig. 5, a sectional detail just below the dotted line 00 m, Fig. 2,

but partly broken out, of one of the pawl-and 4o ratchet wheels andbrake; Fig. 6, a partial longitudinal section of the two shafts whichactuate the two worms and some of their attached parts,to be described;and Fig. 7 shows details of one of the whip-rolls.

The frame-work A has bearings to support its crank-shaft A, having agear, A which is engaged by a gear, A*', on the cam or pickeroperatingshaft A, the latter gear being driven by a bevel-gear, A, on a shaft, A,having usual fast and loose pulleys, A A, which will be driven by abelt.

The loom herein described is to control two sets, B B, of warp comingfrom two warpbeams, B 13 having usual heads or flanges, 40, andprovided, respectively, with wormgears 13 B which are engaged,respectively, by worms C D. The warp B is passed over a whip-roller, E,and the warp B over a whip-roller E, the said whip-rollers beingcomposed of tubes held between pendent arms E E and E E respectively,one arm at each end of a whip-roll. Instead of extending the fulcra ofthe said arms across the l0om,as usual, the said arms are each supported by short journals 2 3, extended from but one side thereof betweentheir upper ends and their pendent lower ends which support thewhip-roll, suchmanner of supporting the said arms enabling the rod whichis usually extended across the loom above the warpthreads to bedispensed with, such being commonly used when the journals for the armsare part of the rod which is employed to connect the said arms together.7

In order that both ends of the whip-rolls E E may vibrate through equaldistances at each end, notwithstanding inequality of the weights orinequality in the pressure of the warp-threads thereon at either end, itis necessary that the said whip-rolls be rigidly or fixedly attachedto'the said arms between their ends.

For convenience of construction and light.

ness we have shown the whip-rolls as composed of tubes which are rigidlysecured to the pendent arms by means of long bolts E", they beingextended through the said tubes and arms, while the tubes are fittedupon annular hubs 25, provided, preferably, with .lugs 26, as in,

Fig. 2, said lugs 26 entering slots at the ends of the tubes andpreventing them from turning on the arms. The whip-rolls thus heldbetween the lower ends of the arms E and E- by the long bolts E*constitute a rigid structure suitable to withstand and resist any unequal strain which may be exerted upon the whip-rolls at either end andleave the warps without rods or shafts extended across their upperportions. The tubes move in the are of a circle about the centersorjournals 2 3 of the arms E E".

The arm E, at the left-hand side of the loom, has pivoted upon it aconnecting-rod, a, which is attached to a pawlcarrier, I), (see Fig. 5,)the hub of which is made to surround the shaft D, carrying the worm D,the said shaft having its bearings at 4 and 5, and having its upper endextended through the tubular shaft carrying the worm O, the shaft 0having its bearings at 5 6. The pawl-carrier b has pivoted to it at 7 apawl, c, acted upon by a spring, (I, the said pawl engaging a ratchet,0, fast on the shaft D. The hub of the ratchet c has an annular groove,f, which receives a forked brake, g, the stem of which is-extendedthrough a spiral spring, 2', and then through a washer, m, restingagainst an arm, n, adjustably secured to the connecting-rod a by bolts0.

Strain on the whip-roll by the warp, as the reed I of the lay J,actuated by the cranks of the shaft A through usual connecting-rods, Jstrikes the fell of. the cloth, carries the whip-rolls forward,and atthe same time causes the connecting-rod a to be moved backward; and whenthe strain is sufiicient to move the connecting-rod far enough in thedirection of the arrow 10, Figs. 2 and 5, to place the pawl of thepawl-carrier back of another tooth (one or more) of the ratchet a, asthe demands of the filling may require, then the said pawl, as the layretires from the fell of the cloth, will turn the ratchet and shaft Dthe distance of one or more teeth, the pawl-carrier and arms '13 beingthen turned in the direction of the arrow 12 by suitable weights, 20.The weights are shown as placed on rods 14, one for each arm E, only oneof the said rods being fully shown, and that in Fig. 1. These weightsconstitute means for returning the whip-roll to its normal position. Theextent of backward movement of the said whip-rolls is limited by thefoot 38 acting on the car 39 of the bracket 64, the said foot and earconstituting a back-stop. The pawl c has a cord, 22, attached to it,which is also joined with the pawl c, hereinafter referred to, andextended over a hook, 23, near the front of the loom. The shaft D has ahand-wheel, 30, by which to turn it by hand. The brake g bearscontinually upon the hub of the ratchet and prevents the rotation of theshaft D farther than it is intended that the pawl should turn it, and asthe pawl operates to carry the ratchet around the spring t iscompressed, thus increasing the pressure of the brake and preventing anyoverrunning. 5

In our Patent No. 264,864 the brake is actuated by the same deviceswhich move the pawl that turns the ratchet, and is not connected in ayielding manner with the arm therein marked 0 and the said brake comesto a hearing against the hub of the ratchet only as the pawl completesthe movement of the same. In that patent the pressure of the brake isnot increased gradually from the commencement to the completion of themovement of the ratchet, as in this our present invention.

The arm E, also at the lefthand side of the loom, has a connecting-rod,c, which engages a pawl-carrier, b, it having a pawl, c, which acts on aratchet, 0, fast on the tubular shaft, O,having the worm C. The hub ofthe ratchet c is acted upon by a friction-brake, g, and a rod, h, whichrod is surrounded by a spring, t, and washer m, and is extended throughan arm, or, attached to the rod a, all substantially as the parts beforedescribed, and having like letters of reference, except the designatingprimes. The arms E have extensions L, bolted thereto at 13, and areacted upon by the weights L.

The warp B for the face of the fabric which is to be wrought in raisedfigures needs to be held under less strain and to have a greatermovement, and consequently each whip-roll operates independently of theother in controlling the warp extended over it.

The arm E at the right-hand end of the loom is provided with anextension, 33, having a foot, 54, which rests upon the extension L ofthe arm E, and the extension 33 has attached to it a rod, 34, joined atits lower end to a lever, 35, pivoted at 36 and acted upon by thetappets 37 on shaft A" to positively move the said arms E E and thewhip-rolls into their extreme backward positions after each beat of thelay should the weights provided for such purpose be for any reasoninsufficient.

By extending one of the worm carrying shafts through the other, thusmaking their axes concentric, or giving them the same center of motion,it is possible to greatly economize space and simplify the constructionof the parts and enable the operator to readily adjust or alter thelet-off at one end of the loom. To enable us to yet further compact theloom and economize space, the erossgirders 1? are carried in close tothe shaft A.

The weights 20 on rods 14, hung on arms E and the weights L on theextensions L of the arm E constitute means for pressing the whip rollersagainst the warp in a yielding manner to follow up any slack therein orto permit the warp to yield to strain thereon.

Thehand-wheel on the shaft c is marked \Ve claim- 1. The two warp-beamsand their gears and the two worms CD to engage and move them, combinedwith the two concentric shafts G D and means to engage and turn the saidshafts, substantially as described.

2. The two whip-rol1s,theirsupporting-arms, and the two concentricshafts O D, their worms, and the warp-beams and their gears, combinedwith means for operating the whip rolls and means intermediate the saidwhiprolls and the said shafts to turn the latter as the whip-rolls aremoved about their journals 2 3, substantially as described.

ICC

8. The loom-frame, the arms E pivoted at opposite sides thereof andprovided with hubs 25, and a tube fitted upon the said hubs'between thesaid arms, combined with a bolt ex- 5 tended through the said tube andconnecting the said arms, all substantially as shown and described.

4. The shaft D, its connected ratchetand pawl and pawl-carrier, the rod(0, and the arms 10 E and whip-r011, and means to operate it, combinedwith the brake and connecting devices betweenit and the rod a, wherebythe pressure of the brake to check the. rotation of the shaft D isgradually increased between the commencement and ending of the effective[5 stroke of the said pawl, thereby preventing excessive rotation of thesaid shaft by the said pawl, substantially as described.

In testimony whereof .we have signed our names to this specification inthe presence of 20 two Subscribing witnesses.

GEORGE OROMPTON.

HORACE WYMAN.

Witnesses:

J. B. SYME, J. A. WARE.

